Anna University Question Paper

1. *X10708* Reg. No. :
Question Paper Code : X10708
B.E./B.Tech. Degree EXAMINATIONS, NOVember/DECember 2020
AND APRIL/MAY 2021
Sixth/Seventh Semester
Automobile Engineering
ME 8692 – finite elements analysis
(Common to Mechanical Engineering, Production Engineering, Manufacturing
Engineering, Mechanical and Automation Engineering and Mechanical
Engineering (Sandwich))
(Regulations 2017)
Time : Three Hours Maximum : 100 Marks
Answer all questions
Part – A (10×2=20 Marks)
1.
Define ‘Dirichlet boundary conditions’.
2. Which weighted residual method will provide similar results as
Ritz method ? Why ?
3. Can use a shape function that provides the sum of its derivatives zero ?
4. Express the governing differential equation for a cantilever beam with
appropriate boundary conditions.
5. How does a quadrilateral finite element differ from a rectangular finite
element ?
6. Express the shape functions for a constant strain triangular finite element.
7. What type of 2D-analysis and finite element will you prefer to analyze a
water dam ?
8. Distinguish a shell element from a plate element.
9. How many Gauss points should be preferred to numerically integrate a
third order polynomial ?
10. State the advantages of using natural coordinates in finite element
methods.

2. X10708 -2- *X10708*
paRT – B (5×13=65 Marks)
11. a) Explain the following with examples :
i) Boundary value problems. (4)
ii) Initial value problems (4)
iii) Eigen value problems (5)
(oR)
b) Discuss the following weighted residual methods to find out the solutions
for boundary value problems, and compare their merits.
i) Least squares method (7)
ii) Collocation method (6)
12. a) The furnace wall shown in Figure below consists of 30 cm of fire brick, 10 cm
of insulation brick and 20 cm of red brick with thermal conductivities
respectively, 0.012, 0.0014 and 0.0086 W/cm/�C. The inner and outer
temperatures are 400�C and 125�C, respectively. Determine the internal
temperature distribution. (13)
(oR)
b) Find the stresses and strains in the bar made up of steel and aluminium
as shown in Figure below. The elasticity modulus of steel and aluminium
are to be taken as 200 GPa and 70 GPa respectively. (13)

3. 13. a) i) Brief the following : Continuity and completeness of elements. (6)
ii) Illustrate the variation of shape functions across nodes in a
quadrilateral finite element. (7)
(oR)
b) Derive the shape functions for an eight-node quadrilateral element. (13)
14. a) Calculate the strain-displacement matrix and the load vector for the
CST elements 1 and 2, and the global load vector for the domain shown
below. (13)
(oR)
b) A long cylinder of outer diameter 100 mm and inner diameter 70 mm
fits snugly in a hole over its full length as shown in Figure below. The
cylinder is then subjected to an internal pressure of 1.8 MPa. Find the
horizontal displacements of two points lying on inner radius which are
vertically apart by a distance of 10 mm. (13)
*X10708* -3- X10708